<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>新增背景属性</title>
  <style>
    .box1 {
      width: 400px;
      height: 400px;
      background-color: skyblue;
      margin: 0 auto;
      font-size: 40px;
      padding: 50px;
      border: 50px dashed rgba(255, 0, 0, 0);
      background-image: url('飞机.jpg');
      background-repeat: no-repeat;
      background-origin: content-box;
      background-clip: content-box;
      background-size: 100% 100%;
      /* background: 背景颜色 背景图片 是否重复 位置 / 大小 原点 裁剪方式; */
      /* 多背景图 */
      background: url('背景图1.png') no-repeat left top, 
                  url('背景图2.png') no-repeat right top,
                  url('背景图3.png') no-repeat left bottom,
                  url('背景图4.png') no-repeat right bottom;
    }
  </style>
</head>
<body>
  <div class="box1"></div>
</body>
</html>